Two radioactive elements $A$ and $B$ initially have same number of atoms. The half life of $A$ is same as the average life of $B$. If $\lambda_A$ and $\lambda_B$ are decay constants of $A$ and $B$ respectively, then choose the correct relation from the given options.
$\lambda_{ A }=\lambda_{ B }$
$\lambda_{ A }=2 \lambda_{ B }$
$\lambda_{ A }=\lambda_{ B } \ln 2$
$\lambda_{ A } \ln 2=\lambda_{ B }$
Half life period of a sample is $15$ years. How long will it take to decay $96.875\%$ of sample .......... $years$
A radioactive sample has ${N_0}$ active atoms at $t = 0$. If the rate of disintegration at any time is $R$ and the number of atoms is $N$, then the ratio $ R/N$ varies with time as
Using a nuclear counter the count rate of emitted particles from a radioactive source is measured. At $t = 0$ it was $1600$ counts per second and $t = 8\, seconds$ it was $100$ counts per second. The count rate observed, as counts per second, at $t = 6\, seconds$ is close to
The radioactive sources $A$ and $B$ have half lives of $2\ hr$ and $4\ hr$ espectively, initially contain the same number of radioactive atoms. At the end of $2\ hours$, their rates of distintegration are in the ratio
Match the nuclear processes given in column $I$ with the appropriate option$(s)$ in column $II$
column $I$ | column $II$ |
$(A.)$Nuclear fusion | $(P.)$ Absorption of thermal neutrons by ${ }_{92}^{213} U$ |
$(B.)$Fission in a nuclear reactor | $(Q.)$ ${ }_{27}^{60} Co$ nucleus |
$(C.)$ $\beta$-decay | $(R.)$ Energy production in stars via hydrogen conversion to helium |
$(D.)$ $\gamma$-ray emission | $(S.)$ Heavy water |
$(T.)$ Neutrino emission |